Convective heat transfer optimization in a circular tube based on local exergy destruction minimization

Wang, Junbo; Liu, Zhichun; Fang, Yuan; Liu, Wei; Chen, Gang

doi:10.1016/j.ijheatmasstransfer.2015.06.031

Cited by 31 publications

(8 citation statements)

References 34 publications

(36 reference statements)

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“…The field synergy principle was presented by Guo et al [13] and Tao et al [14], and was validated on numerous heat transfer phenomena [15][16][17][18][19][20][21][22][23][24][25]. The field synergy principle suggests that the heat transfer rate could be optimized by coordinating the velocity field and temperature gradient for a certain situation.…”

Section: Introductionmentioning

confidence: 94%

Field Synergy Analysis and Optimization of the Thermal Behavior of Lithium Ion Battery Packs

Jia

Huo

et al. 2017

Energies

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Abstract:In this study, a three dimensional (3D) modeling has been built for a lithium ion battery pack using the field synergy principle to obtain a better thermal distribution. In the model, the thermal behavior of the battery pack was studied by reducing the maximum temperature, improving the temperature uniformity and considering the difference between the maximum and maximum temperature of the battery pack. The method is further verified by simulation results based on different environmental temperatures and discharge rates. The thermal behavior model demonstrates that the design and cooling policy of the battery pack is crucial for optimizing the air-outlet patterns of electric vehicle power cabins.

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Section: Introductionmentioning

confidence: 94%

Field Synergy Analysis and Optimization of the Thermal Behavior of Lithium Ion Battery Packs

Jia

Huo

et al. 2017

Energies

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“…Liu et al [18][19][20][21][22][23][24] proposed the concept of a local exergy destruction rate based on convective heat transfer, obtaining the expression of the local exergy destruction rate, which can be used to represent the irreversible loss in the convective heat transfer process, then applied the exergy destruction minimization as the optimization criterion in the exchanged heat transfer tube.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Optimization of Waste Heat Recovery in a Sinter Vertical Tank

Liu

Shi-cheng

et al. 2019

Energies

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In this paper, a two-dimensional steady model is established to investigate the gas-solid heat transfer in a sinter vertical tank based on the porous media theory and the local thermal non-equilibrium model. The influences of the air flow rate, sinter flow rate, and sinter particle diameter on the gas-solid heat transfer process are investigated numerically. In addition, exergy destruction minimization is used as a new principle for heat transfer enhancement. Furthermore, a multi-objective genetic algorithm based on a Back Propagation (BP) neural network is applied to obtain a combination of each parameter for a more comprehensive performance, with the exergy destruction caused by heat transfer and the one caused by fluid flow as the two objectives. The results show that the heat dissipation and power consumption both gradually increase with an increase of the air mass flow rate. Additionally, the increase of the sinter flow rate results in a decrease of the heat dissipation and an increase of the power consumption. In addition, both heat dissipation and power consumption gradually decrease with an increase of the sinter particle diameter. For the given structure of the vertical tank, the optimal operating parameters are 2.99 kg/s, 0.61 kg/s, and 32.8 mm for the air flow rate, sinter flow rate, and sinter diameter, respectively.

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“…Other than EGM, a new approach called “exergy destruction minimization” was proposed for process optimization. Wang et al defined the local exergy destruction rate to express the irreversible losses in the convective heat transfer process. The process optimization was devised for minimizing the exergy destruction rate in the flow in a circular tube.…”

Section: Introductionmentioning

confidence: 99%

Theoretical studies on energy degradation estimation and minimization in laminar convective flow towards the microscale

Rastogi

Mahulikar

2018

Heat Trans. Asian Res.

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The energy degraded into heat (q deg ) in laminar microconvective flow is of fundamental interest for minimizing the irreversibilities. The change in q deg for N-number of microtubes each of diameter (D N ) is studied relative to the reference tube (N = 1) of 1 mm diameter, towards the microscale. The total mass flow rate and total heat flow rate to be removed are kept fixed through all N tubes. Resultsshow that for given l, there exists an optimum D N ( = D N,opt ) and a corresponding optimum N at which, the change in sum-total q deg is minimum. As l decreases, D N,opt shifts towards the microscale. General criterion for D N,opt is analytically obtained in terms of Peclet number, Brinkman number, and dimensionless microtube length. The reported study and findings are of significance for the optimum design of microchannel heat sinks.Nomenclature:̇g en , entropy generation rate (W K −1 );̇, mass flow rate (kg s −1 ); ′′ w , wall heat flux (W cm −2 ); A cs , cross sectional flow area (m 2 ); A sur , surface area (m 2 ); C p , specific heat at constant pressure (J kg −1 K −1 ); D, tube diameter ( m); h, convective heat transfer coefficient (W m −2 K −1 ); k, thermal conductivity (W m −1 K −1 ); l, tube length (cm); N, number of microtubes (-); q deg , energy degraded (W); q w , convective heat transfer rate (W); r, radial direction (m); R, tube radius ( m); R th,conv , convective thermal resistance (K W −1 ); T, fluid temperature (K); u, axial velocity (m s −1 ); z, axial (flow) direction (m) Greek scripts: , thermal diffusivity (m 2 s −1 ); w , wall shear stress (Pa); , dynamic viscosity (Pa s); , density (kg m −3 )

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Convective heat transfer optimization in a circular tube based on local exergy destruction minimization

Cited by 31 publications

References 34 publications

Field Synergy Analysis and Optimization of the Thermal Behavior of Lithium Ion Battery Packs

Field Synergy Analysis and Optimization of the Thermal Behavior of Lithium Ion Battery Packs

Numerical Simulation and Optimization of Waste Heat Recovery in a Sinter Vertical Tank

Theoretical studies on energy degradation estimation and minimization in laminar convective flow towards the microscale

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